ANHB3324 Lecture Notes - Lecture 5: Nasociliary Nerve, Common Carotid Artery, Ciliary Muscle
3 Jun 2018
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LECTURE FIVE: Cranial Cavity Foramen and Orbit
Key Foramen:
• Foramen ovale → 3rd division of trigeminal nerve
• Lateral → foramen spinosum → where middle meningeal artery runs
• Behind 2 foramen → carotid canal → where carotid artery runs
• Adjacent to carotid canal → jugular foramen → jugular vein, CN IX, X, XI
• Foramen lacerum → lacerated edges → nothing passes through
• On palate → greater and lesser foramen palate → greater and lesser
palatine nerves
• Incisive canal → where local anesthetic is injected into
• Cribiform plate → CN I passes through
• Optic canal → CN II passes through
• Supraorbital fissure → between greater and lesser wings of sphenoid
bones → CN III, IV, 1st division of V, VI
• Foramen rotundum → 2nd division of trigeminal nerve
• Internal auditory meatus → CN VII, VIII leaves
• Hypoglossal canal → CN XII → edge of foramen magnum
Bones of the Orbit:
• Many bones involved
• Frontal bone *
• Lacrimal bone → where lacrimal ducts are
• Ethmoid bone → most lateral component
• Zygomatic bone *
• Maxillary bone *
• Palatine bone → smallest component
• Sphenoid bone → not a surface bone
Key Structures in the Eyeball
• Cornea
• Iris
• Pupil
• Lens
• Ciliary body
• Vitreous
• Retina → extension of brain, key structure
• Choroid → where blood vessels lie, can be seen in retina
• Sclera
• Optic nerve
Optic Nerve:
• Optic tract → radiation → visual cortex
• Projected to cells in cortex that are registered/seen
• Processing of information happens in occipital lobe
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